Hi edec
Check this link:
http://zone.ni.com/devzone/devzone.nsf/webcategories/8AB251B3D450F9F9862567ED00514489?opendocument&node=DZ52316_US
There are some nice examples which show how can retrigger AO.
Hope this helps
Luca P.
Application Engineer
National Instruments
Regards,
Luca